ICP DAS USA GW-7553-B User Manual page 62

Figure 55 Send Modbus command (output data: 0xFF, 0xFF)
Figure 57 Receive "0xFF" in the input data area
Table 19 Receive "0xFF" in the input data area
Module
Input module
PS:
Modbus command:
Query message
DA FC
01 0F
GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 62
Byte Data type Representation
Input 6 Byte
Input 7 Byte
SA SA NO
(Hi) (Lo) (Hi)
00 00 00
Hex
Hex
NO
BC DATA
(Lo)
10 02 FF
Value
0xFF
0xFF
FF